Filler



Nov. 10, 1936. H. GRMMER 2050304 FILLER Filed Aug. 25, 1954 PatentedNov. 10, 1936 UNITED STATES PATENT OFFICE FILLER Application August 25,1934, Serial N0. 741,415 In Germany July 19, 1933 1 Claim.

This invention relates 1:0 a filler fo-r automatically sealing puncturedpneumatic tires.

There are various kinds of liquid and solid fillers known for thispurpose, and one of the la.tter comprises a plurality of small discs ofuniform thickness which are used in connection with a coarse-grained andfine-grained cohesive mineral powder to close the air gaps produced bythe discs on account of their uniform thiokness and rigiclity. It hasbeen found that the use of coarse-grained powder necessarily preventsthe discs from lying closely an top of one another anal thus interferesWith complete sealing.

This drawback is overcome according 1:0 the invention by producing afiller consisting of small discs o1 plates which are shaped like a 1ensor lenti1 and have thin and sharp edges. The sea1- ing effect of thediscs is thus considerably improved, and it is possible, to use on1yfine-grained. powder.

By way of example, the invention is illustrated in the accompanyingdrawing, in which Figure 1 is a, sectional view showing the position ofthe fi11ers within the inner tube of a revolving whee1 having apneumatic tire, and indicating the a1- rangement of discs over apuncture; Fig. 2 a detail view of a filler element according t theinvention.

Figs. 1 and. 2 show a filler according to the invention, which consistsof the small plates or discs e having the form of a lentil with sha.rpedges. This form imparts so the discs great elasticity and permits themto 1ie above the puncture d 5 without forming gaps, so tha.t theirsealing efiect is considerably improved and the use of coarsegrainedpowder can be dispensed with.

'Ihe discs according to the invention act as follows: They are placedwithin the inner tube together With some fine-grained cohesive powder.When a travelling whee1 is punctured, air within the tube presses asmall amount of powder outside through the hole formed and entrains thenearest disc which is thus placed as sealing e1ement over the hole andheld in position by the outward pressure of the air.

I claim:-

A filler for automatically sealing punctured 2 pneumatic tires,comprising a plurality of 1ensshaped elastic discs with sharp edgesadapted to be drawn into and held in position above a puncture by theoutward pressure of the air within the tire.

HEINRICH GRUMMER.

